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copper is a good conductor of electricity but cuso4 is conducting only in the molten state. Why?

       Metals consist of a positive ionic lattice which is primarily a lattice of atoms , each containing an outer shell of electrons that travel freely by dissociating from their parent atoms . According to sea theory , when electricity is passed through the metal then these free electrons start moving toward the positive end and new electrons generated acquired their position. These freely moving electrons allows the metal to conduct electric current. So, copper in metallic state is a good conductor of electricity.

      While in the case of CuSO4, it is normally an ionic solid and due to the strong ionic bond they does not have free electron exist as they are bound together. So, it wont be able to conduct electricity. When solid CuSO4 is added to water, it gets dissolved in the water. As the CuSO4 is an electrolyte, it splits into Cu2+ and SO42− ions and move freely in the solution contributing to its good conductivity.

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In the solid state, the Cu2+ and SO42- ions are locked into a crystalline structure, and all electrons are locked into place; because electrons are not free to move, no electrical current can flow. Copper (II) Sulfate CuSO4 can only conduct electricity when the ions are separated, as when this compound is dissolved in water. This "disassociation" permits electrons to be removed from the negative ions and added to the positive ions by an electrical potential, resulting in an electrical current
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The conduction of electricity depend upon the presence of free electron.if a substance having free electron then it can conduct electricity(called as conducter) and the substance which does not have free electron cannot conduct electricty(called as insulator).

in copper it have free electron in its initial state as its a metal, and all metals are good conducter of electricity.

but in cuso4 its a ionic solid and due to strong ionic bond they does not have free electron exist as they are bound together.

but when they dissolved in water their bond will break and the electrons are free to move .thus it can conduct electricity in molten state..

u can take up the example of NACL too, its also conduct electricity in molten state..

HOPE IT HELPS

THUMBS UP PLZZ..

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copper in solid state conducts electricity as u write on question but after bonding with any elements its property differs as in unbonded state so the answer is above cuso4 conducts not in solid but in molten state
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u can also see molecular orbital theorey and conductive and insulative property
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well its simple
copper is a metal, so the free electrons of the metal helps in conduction.
where as cuso4 is an ionic solid,which dosen't have any free ions or electrons for conduction, in molten state the ions of the solid dissociate and are free for conduction.
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